中国物理B ›› 2016, Vol. 25 ›› Issue (11): 113401-113401.doi: 10.1088/1674-1056/25/11/113401

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Landau-Zener model for electron loss of low-energy negative fluorine ions to surface cations during grazing scattering on a LiF (001) surface

Wang Zhou(周旺), Meixiao Zhang(张鹛枭), Lihua Zhou(周利华), Hu Zhou(周虎), Yulong Ma(马玉龙), Yanling Guo(郭艳玲), Lin Chen(陈林), Ximeng Chen(陈熙萌)   

  1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 收稿日期:2016-01-16 修回日期:2016-07-08 出版日期:2016-11-05 发布日期:2016-11-05
  • 通讯作者: Lin Chen, Ximeng Chen E-mail:chenlin@lzu.edu.cn;chenxm@lzu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11175075, 11405078, 11474140, 11404152, and 11305083).

Landau-Zener model for electron loss of low-energy negative fluorine ions to surface cations during grazing scattering on a LiF (001) surface

Wang Zhou(周旺), Meixiao Zhang(张鹛枭), Lihua Zhou(周利华), Hu Zhou(周虎), Yulong Ma(马玉龙), Yanling Guo(郭艳玲), Lin Chen(陈林), Ximeng Chen(陈熙萌)   

  1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • Received:2016-01-16 Revised:2016-07-08 Online:2016-11-05 Published:2016-11-05
  • Contact: Lin Chen, Ximeng Chen E-mail:chenlin@lzu.edu.cn;chenxm@lzu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11175075, 11405078, 11474140, 11404152, and 11305083).

摘要: There is no available theoretical description of electron transfer from negative projectiles at a velocity below 0.1 a.u. during grazing scattering on insulating surfaces. In this low-velocity range, electron-capture and electron-loss processes coexist. For electron capture, the Demkov model has been successfully used to explain the velocity dependence of the negative-ion fraction formed from fast atoms during grazing scattering on insulating surfaces. For electron loss, we consider that an electron may be transferred from the formed ionic diabatic quasi-molecular state to the formed covalent diabatic quasi-molecular state by the crossing of the potential curves of negative projectiles approaching the surface cations, which can be described by the Landau-Zener two-energy-level crossing model. Combining these two models, we obtain good agreement between the experimental and calculated data for the F--LiF(001) collision system, which is briefly discussed.

关键词: charge transfer, negative ion, grazing scattering, ionic crystal

Abstract: There is no available theoretical description of electron transfer from negative projectiles at a velocity below 0.1 a.u. during grazing scattering on insulating surfaces. In this low-velocity range, electron-capture and electron-loss processes coexist. For electron capture, the Demkov model has been successfully used to explain the velocity dependence of the negative-ion fraction formed from fast atoms during grazing scattering on insulating surfaces. For electron loss, we consider that an electron may be transferred from the formed ionic diabatic quasi-molecular state to the formed covalent diabatic quasi-molecular state by the crossing of the potential curves of negative projectiles approaching the surface cations, which can be described by the Landau-Zener two-energy-level crossing model. Combining these two models, we obtain good agreement between the experimental and calculated data for the F--LiF(001) collision system, which is briefly discussed.

Key words: charge transfer, negative ion, grazing scattering, ionic crystal

中图分类号:  (Interactions of atoms and molecules with surfaces)

  • 34.35.+a
78.55.Fv (Solid alkali halides) 79.20.Rf (Atomic, molecular, and ion beam impact and interactions with surfaces)